View from the intersection of Chartres and St. Peter Streets, New Orleans. The Cabildo is on the left and next to it is St. Louis Cathedral, with the Presbytere further down. The cathedral was designed by J. N. B. Pouilly and was dedicated in 1851. The Cabildo was built 1796-1799 and the mansard roof was added in 1847. This was where the documents were signed in December 1803 transferring Louisiana from France to the United States. The building served as the City Hall 1803-1853 and housed the Louisiana State Supreme Court 1853-1911.